[infiniband] Call ib_open() only when opening the IPoIB net device

Defer the call to ib_open() until we want to actually open the device,
rather than when the device is registered.

src/drivers/infiniband/arbel.c

@@ -2175,6 +2175,10 @@ static int arbel_probe ( struct pci_device *pci,
 	if ( ( rc = arbel_create_eq ( arbel ) ) != 0 )
 		goto err_create_eq;
 
+	/* Update MAD parameters */
+	for ( i = 0 ; i < ARBEL_NUM_PORTS ; i++ )
+		ib_smc_update ( arbel->ibdev[i], arbel_mad );
+
 	/* Register Infiniband devices */
 	for ( i = 0 ; i < ARBEL_NUM_PORTS ; i++ ) {
 		if ( ( rc = register_ibdev ( arbel->ibdev[i] ) ) != 0 ) {

src/drivers/infiniband/hermon.c

@@ -2244,6 +2244,10 @@ static int hermon_probe ( struct pci_device *pci,
 	if ( ( rc = hermon_create_eq ( hermon ) ) != 0 )
 		goto err_create_eq;
 
+	/* Update MAD parameters */
+	for ( i = 0 ; i < HERMON_NUM_PORTS ; i++ )
+		ib_smc_update ( hermon->ibdev[i], hermon_mad );
+
 	/* Register Infiniband devices */
 	for ( i = 0 ; i < HERMON_NUM_PORTS ; i++ ) {
 		if ( ( rc = register_ibdev ( hermon->ibdev[i] ) ) != 0 ) {

src/drivers/net/ipoib.c

@@ -926,6 +926,13 @@ static int ipoib_open ( struct net_device *netdev ) {
 	struct ipoib_mac *mac = ( ( struct ipoib_mac * ) netdev->ll_addr );
 	int rc;
 
+	/* Open IB device */
+	if ( ( rc = ib_open ( ipoib->ibdev ) ) != 0 ) {
+		DBGC ( ipoib, "IPoIB %p could not open device: %s\n",
+		       ipoib, strerror ( rc ) );
+		goto err_ib_open;
+	}
+
 	/* Allocate metadata queue set */
 	if ( ( rc = ipoib_create_qset ( ipoib, &ipoib->meta,
 					IPOIB_META_NUM_CQES,
@@ -971,6 +978,8 @@ static int ipoib_open ( struct net_device *netdev ) {
  err_create_data_qset:
 	ipoib_destroy_qset ( ipoib, &ipoib->meta );
  err_create_meta_qset:
+	ib_close ( ipoib->ibdev );
+ err_ib_open:
 	return rc;
 }
 
@@ -992,6 +1001,9 @@ static void ipoib_close ( struct net_device *netdev ) {
 	/* Tear down the queues */
 	ipoib_destroy_qset ( ipoib, &ipoib->data );
 	ipoib_destroy_qset ( ipoib, &ipoib->meta );
+
+	/* Close IB device */
+	ib_close ( ipoib->ibdev );
 }
 
 /** IPoIB network device operations */

src/include/gpxe/infiniband.h

@@ -306,6 +306,8 @@ struct ib_device {
 	struct ib_device_operations *op;
 	/** Port number */
 	unsigned int port;
+	/** Port open request counter */
+	unsigned int open_count;
 
 	/** Port state */
 	uint8_t port_state;
@@ -364,6 +366,8 @@ extern void ib_complete_recv ( struct ib_device *ibdev,
 			       struct ib_queue_pair *qp,
 			       struct ib_address_vector *av,
 			       struct io_buffer *iobuf, int rc );
+extern int ib_open ( struct ib_device *ibdev );
+extern void ib_close ( struct ib_device *ibdev );
 extern int ib_mcast_attach ( struct ib_device *ibdev, struct ib_queue_pair *qp,
 			     struct ib_gid *gid );
 extern void ib_mcast_detach ( struct ib_device *ibdev,
@@ -389,27 +393,6 @@ ib_poll_cq ( struct ib_device *ibdev, struct ib_completion_queue *cq ) {
 	ibdev->op->poll_cq ( ibdev, cq );
 }
 
-/**
- * Open port
- *
- * @v ibdev		Infiniband device
- * @ret rc		Return status code
- */
-static inline __always_inline int
-ib_open ( struct ib_device *ibdev ) {
-	return ibdev->op->open ( ibdev );
-}
-
-/**
- * Close port
- *
- * @v ibdev		Infiniband device
- */
-static inline __always_inline void
-ib_close ( struct ib_device *ibdev ) {
-	ibdev->op->close ( ibdev );
-}
-
 /**
  * Check link state
  *

src/net/infiniband.c

@@ -391,6 +391,42 @@ void ib_complete_recv ( struct ib_device *ibdev, struct ib_queue_pair *qp,
 	qp->recv.fill--;
 }
 
+/**
+ * Open port
+ *
+ * @v ibdev		Infiniband device
+ * @ret rc		Return status code
+ */
+int ib_open ( struct ib_device *ibdev ) {
+	int rc;
+
+	/* Open device if this is the first requested opening */
+	if ( ibdev->open_count == 0 ) {
+		if ( ( rc = ibdev->op->open ( ibdev ) ) != 0 )
+			return rc;
+	}
+
+	/* Increment device open request counter */
+	ibdev->open_count++;
+
+	return 0;
+}
+
+/**
+ * Close port
+ *
+ * @v ibdev		Infiniband device
+ */
+void ib_close ( struct ib_device *ibdev ) {
+
+	/* Decrement device open request counter */
+	ibdev->open_count--;
+
+	/* Close device if this was the last remaining requested opening */
+	if ( ibdev->open_count == 0 )
+		ibdev->op->close ( ibdev );
+}
+
 /**
  * Attach to multicast group
  *
@@ -530,10 +566,6 @@ int register_ibdev ( struct ib_device *ibdev ) {
 	ibdev_get ( ibdev );
 	list_add_tail ( &ibdev->list, &ib_devices );
 
-	/* Open link */
-	if ( ( rc = ib_open ( ibdev ) ) != 0 )
-		goto err_open;
-
 	/* Add IPoIB device */
 	if ( ( rc = ipoib_probe ( ibdev ) ) != 0 ) {
 		DBGC ( ibdev, "IBDEV %p could not add IPoIB device: %s\n",
@@ -546,8 +578,6 @@ int register_ibdev ( struct ib_device *ibdev ) {
 	return 0;
 
  err_ipoib_probe:
-	ib_close ( ibdev );
- err_open:
 	list_del ( &ibdev->list );
 	ibdev_put ( ibdev );
 	return rc;
@@ -562,7 +592,6 @@ void unregister_ibdev ( struct ib_device *ibdev ) {
 
 	/* Close device */
 	ipoib_remove ( ibdev );
-	ib_close ( ibdev );
 
 	/* Remove from device list */
 	list_del ( &ibdev->list );